1221320234 has 16 divisors (see below), whose sum is σ = 1884684672. Its totient is φ = 593316048.

The previous prime is 1221320227. The next prime is 1221320251. The reversal of 1221320234 is 4320231221.

It is a super-2 number, since 2×1221320234² = 2983246227955629512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45014 + ... + 66849.

It is an arithmetic number, because the mean of its divisors is an integer number (117792792).

Almost surely, 2^1221320234 is an apocalyptic number.

1221320234 is a deficient number, since it is larger than the sum of its proper divisors (663364438).

1221320234 is a wasteful number, since it uses less digits than its factorization.

1221320234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112021.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1221320234 is about 34947.3923776868. The cubic root of 1221320234 is about 1068.9150308906.

Adding to 1221320234 its reverse (4320231221), we get a palindrome (5541551455).

The spelling of 1221320234 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred thirty-four".